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      1 /*
      2  * Copyright (C) 2008 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include <stdio.h>
     18 #include <fcntl.h>
     19 #include <unistd.h>
     20 #include <errno.h>
     21 #include <string.h>
     22 
     23 #include <sys/types.h>
     24 #include <sys/stat.h>
     25 
     26 #define LOG_TAG "Vold"
     27 
     28 #include <cutils/log.h>
     29 
     30 #include "Xwarp.h"
     31 const char *Xwarp::XWARP_BACKINGFILE = "/mnt/secure/asec/xwarp.img";
     32 const char *Xwarp::XWARP_CFG = "/sys/fs/yaffs/mtd3/xwarp-backing-store";
     33 const char *Xwarp::XWARP_READY = "/sys/fs/yaffs/mtd3/xwarp-ready";
     34 const char *Xwarp::XWARP_MIRROR_STATUS = "/sys/fs/yaffs/mtd3/xwarp-mirror";
     35 
     36 int Xwarp::enable() {
     37     return doEnableDisable(true);
     38 }
     39 
     40 int Xwarp::disable() {
     41     return doEnableDisable(false);
     42 }
     43 
     44 int Xwarp::status(bool *ready, unsigned *mirrorPos, unsigned *maxSize) {
     45     FILE *fp;
     46 
     47     *ready = false;
     48     *mirrorPos = 0;
     49     *maxSize = 0;
     50     if (!(fp = fopen(XWARP_READY, "r"))) {
     51         return -1;
     52     }
     53 
     54     fscanf(fp, "%d", (int *) ready);
     55     fclose(fp);
     56 
     57     if (!(fp = fopen(XWARP_MIRROR_STATUS, "r"))) {
     58         return -1;
     59     }
     60 
     61     fscanf(fp, "%u %u", mirrorPos, maxSize);
     62     fclose(fp);
     63     return 0;
     64 }
     65 
     66 int Xwarp::doEnableDisable(bool enable) {
     67     const char *tmp;
     68     int fd = open(XWARP_CFG, O_WRONLY);
     69 
     70     if (fd < 0)
     71         return -1;
     72 
     73     tmp = (enable ? XWARP_BACKINGFILE : "");
     74 
     75     if (write(fd, tmp, strlen(tmp)+1) < 0) {
     76         SLOGE("Failed to write xwarp cfg (%s)", strerror(errno));
     77         close(fd);
     78         return -1;
     79     }
     80 
     81     close(fd);
     82     return 0;
     83 }
     84